Add Min and Max Values to Driver Expression?
Min max

Use the expression min(max(v, 0.5), 1.25) or its dual max(0.5, min(v, 1.25)) where v is the driver variable (sound curve value)

&gt;&gt;&gt; v = 0.05
&gt;&gt;&gt; min(max(v, 0.5), 1.25)
0.5

&gt;&gt;&gt; v = 3
&gt;&gt;&gt; min(max(v, 0.5), 1.25)
1.25

&gt;&gt;&gt; v = 1.1
&gt;&gt;&gt; min(max(v, 0.5), 1.25)
1.1


If you wish to double the variable v simply replace v with 2 * v in expression.

I would recommend you normalize the values in some way What&#39;s the range of values on a sound-baked f-curve?

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